Dynamo-electric machine.



F. G. HALL.

DYNAMO ELECTRIC MACHINE.

APPLIOATIOH rum) 001220, 1908.

1,036,835, Patented Aug. 27, 1912.

- 2 SHEETS-SHEET 1.

INVENTOR 0 M 12,

ATTORNEY WITNESSES:

F. 0. HALL. DYNAMO ELECTRIC MACHINE.

2 SHEETS-SHEET 2.

' ATTORNEY UNITED STATES PATENT OFFICE.

FRED C. HALL, OF WILKINSBURG, PENNSYLVANIA,

WESTINGHOUSE ELECTRIC &; MANUFACTURING COMPANY, OF EAST MENTS, TO

ASSIGNOR, BY MESNE ASSIGN- PITTSBURGH, PENNSYLVANIA, A CORPORATION OFPENNSYLVANIA.

DYNAMO-ELECTRIC MACHINE.

Specification of Letters Yatent.

Patented Aug. 27, 1912.

Application filed October 20, 1908. Serial No. 458,613.

To all whom it may concern Be it known that I, Finn) C. HALL, a citizenof the United States, and a resident of ilkinsburg, in the county ofAllegheny and State of Pennsylvania, have invented a new and usefulImprovement in Dynamo- Electric ll Iachines, of which the following is aspecification.

My invention relates to dynamo electric machines and it has specialreference to such direct current generators of large capacity as areprovided with two commutators.

The object of my invention is to so 1mprove the structure of a machineof the class,

above indicated as to facilitate its manufacture and adapt it for highspeed operation.

It is desirable, in some cases, to equip direct current generators oflarge capacity with two commutators instead of one, in order to obtainan adequate cont-act surface Without necessitating a commutator of abnormal length. This is particularly true when the machine is designedfor operation at relatively high speeds, since itis difiicult to build avery long commutator which is capable of resisting the centrifugalforces to which it is subjected under these conditions.

NVhen two commutators are used, it is desirable to connect theircorresponding segments together by conductors which are preferablydisposed between the laminated core structure and its supporting frameor spider. The above mentioned conductors are usually bent in an outwarddirection, at the points where they extend beyond'the core structure,and are joined to the necks of the commutator segments adjacent to thepoint of connection between the armature coils and the necks.

According to my present invention I materially shorten the length of thecommutator necks so that their outer extremities are substantiallyopposite the ends of the passageways through which the conductors whichinterconnect the two commutators extend. The end connecting portions ofthe armature coils are bent inwardly close to the ends of the core slotsand the connectors which join the'end connecting portions with thecommutator necks extend outwardly in an axial direction, beingsubstantially parallel to the extremities of the interconnectingconductors. By this art"( cent the V shaped end connecting portionsofthe armature winding lie in a plane Which is perpendicular to the axisof the machine instead of being disposed in the form of a cylinder as inthe usual arrangement. Furthermore, the length of the lnterconnecting byinsulating cylinders, the successive layers being firmly held inposition against an annular projection on the rim of the spider whichsupports the core structure by means of band wire.

Figure 1 of the accompanying drawings is a sectional elevation of aportion of a dynamo electric machine constructed in accordance with myinvention. Fig. 2 is a partial end elevation and Fig. 3 is a detail viewshowing the disposition of the extremities of the conductors whichinterconnect the segments of the two commutat-ors of the machine.

Referring to the drawings, the device here illustrated comprises ahollow cylindrical laminated core member 1, which is supported on aspider 2 having cylindrical projections 3 and at for severallysupporting a pair of similar commutators 5 and 6. The core member 1 isprovided with a plurality of peripheral slots 7 in which armature coils8 are partially included. The end portions of the coils aresubstantially V shaped and are bent inwardly close to the ends of thecore slots, and are separated from the end frames 9 of the machine bymeans of wood blocks 10.

Each of the commutators 5 and 6 comprises a plurality of bars orsegments 11 which are supported, in the usual manner, by projections 12on the cylinders 3 and i and clamping V rings 13, which are adjustablysecured to the outer ends of the cylinders. The barsll are provided withnecks 14:, which are secured to their inner ends and project radiallytherefrom. The extremities of the necks 14 are joined to the coils 8 bymeans of connectors 15, and the corresponding necks on the twocommutators are joined by conductors 16, which are located in recesses17 in the rimof the spider 2 and are not aflected by the magnetic fluxesin the armature core 1.

It will be readily understood by those.

familiar with the art that a very large number of conductors will berequired to interconnect all of the necks of the two commutators and,since they may only extend through the spider at certain intervalsaround its circumference, they are preferably wrapped into bundles,which are located in the recesses 17, as above indicated. The portionsof the conductors whichlie between the ends of the recesses 17 and thecommutator necks must be carefully supported in order t-hat the machinemay safely operate at high speeds, and, in order to do this to the bestadvantage, I have provided V shaped spacing blocks 18 between the endsof adjacent recesses and diamond shaped spacing blocks 19 between thetwo. bundles 20 and 21, into which the conductors disposed in eachrecess are divided.

The advantages gained from the use of the blocks referred to above areapparent from Fig. 3 of the drawings, from which it will be observedthat the interconnecting conductors are kept close together for as greata part of the distance external to the recesses as is possible andconsistent with the condition that they shall be equally spaced at theirextremities. Thediamond shaped blocks 19 and the V shaped spacing blocks18 correspond in thickness to the widths of the strap conductors whichthey separate, and are mounted directly upon'the cylindrical surfaces ofthe annular projections 25 which support the connectors,

15 and the ends of the conductors 16.

While the structure illustrated is especlally compact, it will beobserved that the ventilation of the commutator necks and of thearmature core and-windings is not interfered with, a circulation of airbeing established through. these parts by means of fan blades 22, whichare secured to .the'arms of the spider. The cylindrical projections 3and 4, on which the commutator segments.

are mounted,- are materially largerthan the inner sleeves or bushings23, which'are fitted directly upon the shaft of the machine (not shownand they are supported from these bushings by means ofintegraljarms 24,in

order that longitudinal ventilating passageways may be established fromthe ends of the commutators to the chambers 26 which,

spider fluxes and the ends of which are uniformly I spaced apart andconnected to the commutator segments and the intermediate portions ofwhich are in compact bundles, and insulating blocks for supporting andspacing the bundles of interconnecting conductors. I

2. In a dynamo electric machine, the combination with an armature coreand two commutator cylinders located at the respective ends of the core,of conductors which are un-influenced by the armature core fluxes andserve to interconnect the segments of the commutators, and means forsupporting and spacing the interconnecting conductors. comprising Vshaped blocks and diamond shaped blocks.

3. In a dynamoelectric machine, the combination with a cylindricalarmature core member, two commutator cylinders located at the respectiveends of the core member,

a ,winding associated with the core member,

and a plurality of conductors which are uninfluenced by the core memberfluxes and serve to interconnect two commutators, of

the annular-supports which are concentric with the commutator cylindersand are of materially less diameter than the cylindrical core member,and means for securlng porinterconnecting conductors to said annularsupports.

In testimony whereof, I have hereunto subscribed my name this 15th dayof Oct.,

' FRED C. HALL. Witnesses: v

THOS. S. Scorr, BIRNEY HINEs.

*tions of the winding and the ends of the

